High-fidelity ion-trap quantum computing with hyperfine clock states

Abstract

We propose the implementation of a geometric-phase gate on magnetic-field-insensitive qubits with ${\hat{\sigma }}^z$-dependent forces for trapped ion quantum computing. The force is exerted by two laser beams in a Raman configuration. Qubit-state dependency is achieved by a small frequency detuning from the virtually-excited state. Ion species with excited states of long radiative lifetimes are used to reduce the chance of a spontaneous photon emission to less than 10${}^{-8}$ per gate-run. This eliminates the main source of gate infidelity of previous implementations. With this scheme it seems possible to reach the fault tolerant threshold.

4 pages, 1 figure

References in corpus (3)

• Process tomography of ion trap quantum gates
• Errors in trapped-ion quantum gates due to spontaneous photon scattering
• Deterministic entanglement and tomography of ion spin qubits

Cited by in corpus (5)

• Quantum computing with trapped ions
• Experimental quantum information processing with 43Ca+ ions
• Quantum control of the hyperfine-coupled electron and nuclear spins in alkali atoms
• Geometric phase gate on an optical transition for ion trap quantum computation
• Decoherence-free preparation of Dicke states of trapped ions by collective stimulated Raman adiabatic passage